Bolt threading and turning device.



C. K. LASSITBB..

BOLT TERBADING AND TURNING Dsvw.

APPLIOATIOH FILED NDV. 22, 1910.

1,006,958, Patented Oct. 24, 1911.

4 SHBETBBHEET l` F1/gul.

"ii uf 2,2 'Mmmm mllllllllllIHIIHIIHIIHNIH IHIIHHWHH S34/manic@ColzmwKLaSSZ/tef @wi/tycoon v my 6m akker/nua C. K. LASSITBR.

BOLT TBBSADING AND TURNING DEVICE. APPLIoA'rIoH FILED Nov. 22, 1510.

Patented 001i. 24, 1911 4 SHEETS-SHEET 2.

atten/um:

C. K. LASSITER.

BOLT THREADING AND TURNING DBVIGE.

APPLICATION FILED NOV. 22,1910.

1,006,958, Patented 0011.24, 1911.

mmww v ln www I am,

C. K. LASSITER. Bom THRBADING AND TURNING DEVICE.

APPLIUATIDN FILED NOV. 22, 1910.

Patented 0G13. 24, 1 91 1.

4 SHEETS-SHEET 4.

v.us

' at Richmond,

UNITED STATES PArENT OFFICE.

COLUMBUS K. LASSITEB, 0F RICHMOND, VIRGINIA. BOLT THREADING AND TURNINGDEVIGE.

specmqauon of Letters Patent. Application Med November 22. '1916. SerialNo.

Patented Oct. 24.-, 1911.

To all whom it may concern:

Be it known that I, COLUMBUS K. LAssI- TER, a citizen of the UnitedStates, residing in the county of Henrico an State of Virginia, haveinvented'new and useful Im rovements in Bolt Threading and rnin evices,of which the following is as ci mation.

his invention relates to a machine or device for automatically andsimultaneously, or through a single, continuous operation, turning orfinishing and threadin thel surfaces of bolt-blanks for the pro uctionof finished bolts.

Heretofore Vthe work of turning or finishing the surfaces of bolt-blanksand4 forming the threads thereon has been performed by two separate andindependent operations on dii'erent machines or by distinct mechanismson a. single machine. 'Y

The object of the present invention is to provide a machine y which thesteps of turning and threading the boltanks may carried out in a singleoperatlon on one and the same machine and in a rapid and economicalmanner.

A further object ,of the :invention is, tin

. provide a Vmachme of this character which "will operateupon di'erentlengths and diameters of bolt-blanks and compensate automatically forvariations between the turnin and threadingr feeds due-to ditferences opitch of the coarse threading dies at different times in the action ofthe machine.

A still further object of the invention is to provide a. machine of thischaracter which will operate upon blanks for bothV straight and taperedbolts.

With these and other objects in view,-the invention consists of thefeatures of construction, combination and arrangement of partshereinafter fully described and claimed, reference being had to theaccompanying drawings, in whichz- Figure 1 is a front `elevation of abolt tu ning and threading device embodying my invention. Fig.- 2 is acentral vertical section through the supporting parts and turning cutterthereof, showing the threading cutter in elevation. .Fig 3 1s asectional elevation of the threading cutter and the die controllingdevices associated therewith.

Fig. 4 is a detail sect-ion on line 4-4- of Fig..

2, showing the construction of one'of'the threads in the use of tine or'supported stop or gage collars. Fig. '5 is a vertical transverse sectionof the same. Fig. 6 is a top plan view, partially in section of thethreading cutter, showingl in dotted lines the movements of certainparts. Fi 7 is a sectional view on the line 7 7 of Figli. vFig. S is a.detail section on the line 8-8 of' Fi 3 showing the trip lever inretracted osland releasing the camv ring whereby the threading dies areadjusted. Fi 9 is a detail view of the upper end of the ocking pin.Figs. Y10 and 11 aredetail views of one of the keepers or lockingblocks. Fig. 12 is a top plan view of the main supporting ring. Fig. 13is a perspective view of one of the leveling sleeves. Fig. 14 is asimilar view of one of' the retaini pins or plungers. Figs 15 and'16 aredetall views of the other keeper or locking block. Fig. 17 is a detailview of the reducing cutter. Fig. 18 is a similar view of the cam memberfor project in the same. f

teferring now more particularly to the drawings 1 designates a mainframe ring or support Jfor the operating parts of the device, which ringmay be mounted'in any preferred manner by radial. arms 2 in a suitableframe structure and is provided at one side with a guide ear 3 and aninternal keyway or groove- 4extendin from the base of said ring upwardlyto and intersecting an an11ular seat groove 5 lformed 4in the topthereof.

Removably mounted in the upper portion of the frame ring or support 1 1sa turnin'gcutter head comprising an annular body portion 6 and a bottomplate 7, said body portion being provided with a laterally extendingannular ange 8 to seat within the groove 5 and thereby 'support saidhead in OSition. The body oi-'tion 6 is closed at its Ease by the bottomp ate 7 to which it is detachably secured by screws 9, both the bodyportion and bottom plate beine' 'provided with alining keys 10 toengagetlie keyway I4, whereby th turning head will be held from rotationin the frame ring and mag be seated accurately therein in proper wor ingposition.

'Arranged within the body portion 6 and` `the plate 7 is a series ofturnlng cuttersyll, s aced at their inner orcuttng'en s 'an adjustableradially 'by means of vertically movable wedge keys 12 operated byadjusting screwsl, by Ywhich tion and also showin the meansA for loc 'nggreater extent downward upon the sleeves inst the resistance of thesprings 48.

' he oscillatory movement lof the cutter 'head is controlled andregulated by sliding i lungers 49 movable in openings 50 in the 25 andprovided at their inner ends `with vertically disposed segmental presserfeet orlugs 51 arranged within the openings l2 and bearing upon therods. The bores 50am closed at their outer ends by screw plugs 52 andeach plunger is hollow to receive a coiled expansion spring 53 by whichit is forced inwardly to cause the presser `foot to bear vupon the rod,the pressure of the several springs 53 serving to normally hold theportlons V43 of the head in engagement with the rods and the openings 42out of axial alinement with the sleeves 45, so that `on the preliminarydownward movement of the head the latter will engage the sleeves andwill be held thereby against further downward movement until the head isturned against the resistance of theA springs 53 to dispose the openin s42 in axial alinement with the sleeves. `he presser feetll are ofsutlicient length to project below the cutter Head and enter and movevertically Vin guide slots 54 in the'leveling sleeves, thus preventingthe head from bemg turned or oscillated too far in either direction andmaintaining at all times a guiding connection between the sleeves andhead in the vertical movements of the latter. The tension of the springs53 may be regulated by adjusting the plugsl 52.

Fixed to the underside of the base 25 is a depending bracket 55 having ahorizontal arm 56 slidably supporting the lower reduced end 57 of alocking pin 58. This looking pin is slidably and rotatably mounted in abearing opening 5S) extending thrugh the .base 25 and is transverselycut away at its upper end to provide a locking finger or shoulder 60.This finger 60 enters a circumferential s lot 6l formed in the cam ring3l in which slot is arranged a locking block or l'ieeper 62 having anend locking shoulder 63 and cut away on its under side to form adiagonally arranged inclined or cam surface 64. When the cam is turnedto project the dies 30, the shoulder-'63 of the block engages the linger60 of the locking bolt 58, by which the cam is held from retrogrademovemen-t and the die is held projected for the` threading operation.The block 62 is carried by a screw 65 movable in a slot 66 in the outerAwall of ,the -slot 61 and passing through a clamping plate or washer 67,by which the block may be adjusted in the slot to vary the throw of theca 'm rin and the locking action, so that the norma position of the diesmay be changed to over or under thread 'boltblanks of a given size, or,in` other words, to vary the de th of the threads as occasion mayrequire. screw .681s prol block.

V.in a chuck or feo'd'device'having vided upon the cam ring to gage andlimit the extent of adjustment Aof the locklng The locking pin is alsoprovided lateral lockinglug 69 to engage a flange or recess 70 at thelower end of a locking block or keeper 71 secured upon 'the under sideof the base 2, to hold the pin from oscillatory movement while itslinger 60 is in engagement with theshoulder 63.

A trip lever 72 is intermediately fulcrumed upon the lower end of thelocking pin, at 73, for pivotal movement in a verwith a tical plane andhas one of its arms extending outwardly' and provided with a rounded lug74 for rocking engagement with the under side of the base 25 and itsother arm extending inwardlv and formed with an internally threaded see\'e 75 receiving the lower threaded end 76 of a contact pin 77, whichpin projects upwardly into the opening 27 so as to be engaged by thelower end o the feeding bolt-blank 78. A coiled siring 79 surrounds theportion 57 of the loc ing pin between the body portion of said pin andthe bracket arm 56 and normally serves to sov force said pin upwardly. Asecond coiled spring 80, of the torsion type, surrounds the part 57 andis terminally connected with the same and an extension 81 from thebracket 55 and operates when the bolt is depressed and the cam turned todiepro jecting position to swing said bolt and the trip lever laterallyand thereby move the contact pin 77 into the path of movement of thebolt.

n Milled stop and gage collars 83 are roviued uuont c rods 20 to supportand limit the downward movement .of the ring 46, leveling sleeves 45head, by which the floating movement of the cutter head will berestrlcted Within determined limits sufficient to effect the threadandthe threading cutter lng of bolt-blanks of determined lengths.

Eaeh of these collars is formed at one side with a radial slot 84receiving a correspondingly movable lookin block or member 85 secured toone end o a substantially semicircular s ring 86, fixed at its oppositeend to the col ar, as at 87. The block or locking member85 is adapted toen a e a transverse notch 88 in the rod to hol t e collar from verticalor oscillatory movement. By, how-V cvertgripping and turning the collarwith sufliclent orce, the inner end of the block will ride on the innervend of the slot as a cam surface and be forced outward orbe retracted,permittin the collar to be released for adjustment. lars may -be moveddownwardly and seated ulpon the upper securing nuts 21, allowing t ethreading cutterA cad to have a greater rang'e of vertical movement.

In `the 'operation of the device,

. the bolt blank 78 1s fixed at its Vupper or headed end a downward feedmotion at a desired rate of speed and also adapted to im art a rotarymotion at a determined rate o Spee-dto the blank, after which time thelever 40 is operated to turn the cam 31 in the manner described toproxect ythe threading dies into engagement wit the blank. As the blankfeeds downward it first passes between the turning cutters i1 and itsouter surface is turned or finished b `the action thereof. The finishedrtion o the bolt passing below'the turnlng cutters and through theopenin 16 then enters the opening 27 in the threa ing cutter headbetween the dies 30. In this operation the movement of the cam to itsprescribed position causes the shoulder 63 of the locking block G2 toengage the finger 60 as the head engages-.the leveling sleeves asdescribed, the Vthreading dies securely grip l the bolt blank to starttheir threading action and the dies and cutter head are permitted toturn with the blank to the extent limited by the openings 42 and untilsaid openings are brought into coaxial alinernent with the sleeves 45,thus providing a coirnpensatingA and verticaldownward movement of thethreading cutter to prevent any irregular action which might ensue underthe com-` bined downward and rotary motion of the blank `if 'thethreading cutter head were fixed against movement. The cutter head willthen be controlled solely by the springs 48 and will be free to float ormove vertically to compensate for any difference which. may existbetween the turning and cutting feeds.

It is preferred in practice to feed the blank at a fairly rapid speedthrough the machine in order to enable a comparatively largenumber ofblanks to be nished and turned within a determined eriod of time. Theturning cutters 11 wil act eliiciently upon the blanks at any rate ofspeed within reasonable limits, but it will, of course,be

.understood that the speed of action of the threading cutters on theblanks will vary according to the pitch of the threads to be formed, andthat some provision must be made to compensate for the differences inthe rate of turning and threadin feeds when a fina or coarse thread isto be armed, If the thread is of such a. pitch that the threadingcutters will operate at the same ratio n the turning cutters or threadthe blank as fast as it passes through the turn ing cutters, it will beunderstood that the threading cutter head will simply have itspreliminary downward movement and partial rotary movement for a levelingand gripping action and will -then'remain stationary on the ide rods 20.If, however, the thread itc should be comparatively tine, in whic eventthe threading feed will be slower than the turning feed, the threadingcutter will move downward on the guide rods against the resistance ofthe springs 48 to allow the blank to have its usual rate of downwardfeed motion, while increasing the tate of travel of the threading cutterfor the threading action,.thl'1s compensating for a variation in 4theturning and threading feeds when the former is faster than the latter.When, on the contrary, the thread to be formed is of coarse pitch, nwhich event the threading ycutters will operate as fast as the bolt isfed or at a. hi her rate of speed, it. will be understood t at thethreading cutter will simply have its preliminary downward rotarymotions for a leveling and gripping action and may then reiriin sta?ionary or feed upwardly on the threads as itforms thel same tocompensate for the difference between the turning and threading feedsunder such conditions. By this operation of making the threading cuttermovable with relation to the turning cutter and instituting acompensating eed action of the character described, bolt blanks on whichany desired itch of thread is to be formed may be simu taneously turnedand threaded in a sin le continuous operation and a comparative y largenumber of bolts finished within a determined period with much betterresults and at less cost than Where the usual practice f turning andthreading the bolts by two separate and independent operations ispursued.

As the blank 78 .feeds downward through the opening 27 it contacts withthe pin 77 and graduali depresses said in and tilts the arm 72 o thetrip lever do nward. B this means the linger 60 and lug 69 are gra uallydrawn out of enga ement with the shoulder 63 of the locking lock 62 andthe flange of the locking block 71. The lever -will be fully de ressedby the blank against the resistance ci) the spring 79 at the end of thethreading) operation, so that said Vlinger and lug will' e fullyretracted, thus freelng the cam ring til-for return movement by thesprin s 34,11; retract the threading dies and att e same time freeingthe locking pin for rotar pressure of t e bolt on the pin 77 and throughthe action of the cam surface 64 of the block 62 6x1 the nger 60 as thecam turns the trip lever will be turned laterally to swing the pin 77out of the path of the bolt an into the receiving recess 82,allowmotion, so that underthe ing thefbolt to pass downward through theopenings 27, 47 and 23 without interference.v

.ally in the reverse direction, which operation would cause, ifpermitted, an oscillatory motion of the 'in 58, by which the cam ringwould beal owed to turn a slight distance back and forth and adjust thecutters to form an irregular or imperfect thread. To revent this'lateral motion of the pin 58, t e locking devices 69 and 70 areprovided, as will be readily understood. As soon as a new bolt isinserted in osition and the' cam ring turnedto roject e dies, it will beunderstood that t e cam surface 64 will move out of engagement with thefinger 60, and by the movementof the ring the shoulder 63 of the block62vwill clear the finger 60, whereupon the' pin 58 will lbe free to beforced upwardand turned by the rings 79 and 80 to adjust said fin erinto ocking engagement with the shoul er 63 and swing the pin 77 intoposition to be engaged by the succeeding bo t, thus autoinatcallyresetting the trip mechanism for further operation-. 1

It -is desirable to provide a means-whereby the end o'f. the fblank tobe threaded may be reduced in diameter rior tothe threading action, inorder toal ow the turned body oi the blank to be subsequently turneddown to a taper, on a separate machine for the production of a taperedbolt.. To this end I provide upon the portion 26 of the thread ingcutter head one or more turning cutters arranged between .adjacentthreading dies. In thevpresent instance I have shown a .single reducingcutter, although a plurality may be used, said cutter comprisin asupport 89 having front and rear gui e 4pieces 90 and 91 perforated toform sup o r for a` sliding turning tool `92, to whic -tool is fixed. a.st'op collar 93 which limits its in- ,ward movement anda laterallyprojecting arm 94. The arm 94 carries a pin 95 movable in a guideVopening in the guide piece 91, and a coiled sprin 96 surrounds thecutter between the gui e piece and the vollm- Sli-S and serves to holdthe .cutter normally retracted. The stem is adapted to be engaged byl acam member 97 carried by a bracket piece 98 secured to the upper face oftll cani ring 32, whereby the reducing cutter will bc projected whensaid cam ring is turned to project the threading dies. It

will thus be seen that upon the downward passage of the -blank beyondthe turnin cutters 11 the lower and of the blank wil first be reduced tothev desired extent by the' ortion.

reducing cutter 92 and the reduced threaded liylhe threading dies. T ebolt 111|# produise-i will, therefore, have a :iircad'cd end 'wasdiameter than the body thereof, allowing the body to be turned down to adesired -taper by taper cutters on a separate machine.

I claim 1. A device for siinultaneousliy7 turning and threadingbolt-blanks, comprising a trmn cutter, and a threading cutter arrang' too crate upon the blank as .it -cornes from t e turningv cutter, Vsaidthreading cutter being mova le relatively to said turning cutter`compensate for variations between the turni and threading feeds. 2, In abolt-blan turning and threading device, the combination of a turningtool, a threading tool arranged .to act upon the blank as it comes fromthe turning tool, means for supporting the threading tool for a floatingmotion rel'ative to the turning tool, and means for automaticallythrowing said threading -tool out of action.

3. In a bolt-blank turning and threading device, the combination of aturning tool, a threading tool arranged -to' act upon the blank as itcomes from the turning tool, means for supporting the threadin tool fora floating motion relative to sai turning tool, and means adapted to beoperated by the blank for automatically throwing said threading tool outof action.

4. In a bolt-blank turning and threading device the combinatibn of aturning tool, a threading tool' arranged to act upon the blank as itcomes. from the turnin tool, means for permitting a relative motionbetweensaid turning and threading tools to compensate for variationsbetween the tu'rning and threading feeds, and means adapted to beoperated by the blank for automatically throwing said threading' toolout of action.

5. In a bolt-blank turning and threadin device the combination of aturning too a threading tool'arranged to act upon the blank as it comesfrom the turning tool, and means for supporting the threading tool for ailioating motion relative to the turning too 6. In a bolt-blank turningand threading device the combination of a turning tool, a threadingtoolarranged to act upon the blank as it comes from the turning tool,and means for permitting a relative motion between said turning andthreading tools to compensate for variations between the turning andthreading feeds.

4l'n a bolt-blank turning and threading devicethe combination of aturning cutter, a threading cutter arranged to -operate u a portion of.the turned blank feeding through the threading cutter, and means forpermitting the threadin cutter to have movement toward or from t eturning cutter to compensate for variations between the turning-feed andthe thread pitch.

8. In a bolt-blank turning and threading device, the 'combination of acutter head provided with cutters toturn the surface of-a feeding androtating bolt-blank, 'a cutter head provided with collapsible dies tothread a p ortion of the turned surface of the blank while the'remainder of said surface is being turned, means operative by Y thefeeding blank for automatically throwing said dies 111 and out, andimeans supportin the 10 threading cutter head for movement re ative tothe turning cutter head during the thre'a and turniu te' oran variationbetween the turn- @Bdnd threa ing feeds.

adapted to o erate u n a feeding and rotatin "bolt b ank, a t readingcutter bodily mova lev relative to said turning cutter, and

zo provided with dies for threading a portion of the blank while theturning operation is in progress, and spring means for supporting saidthreading cutter and. permitting movement thereof.

10. 'In a bolt-blank turning and threading devioe'the combination of aturning cutter, a spring supported H oating threading cutter arranged tooperateupon a portion of the turned blankand while the turning operationis stillin progress, and means controlled by the blank' forautomatically throwing said threading cutter out of operation.

11. In a device vfor simultaneously turning and threading Va bolt-blankhaving u combincd rotary and forwar'd feed motion,.the i combination ofa.l .turningl head, a spring supported oating three er arranged tooperate upon a portion of the turned blank as it passes beyond theturning head and while the turning operation is in progress, and meansfor automatically throwing said threader out of` action on thecompletion .of the threading operation.

12. In a device for simultaneously ,turning and threading bolt-blanks,the combinationl of a relatively stationary turniiigeuttet, a floatingthreading cutter arranged to operate upon a portion of the blank comingfrom the turning cutter, guides forl said threading cutter, andsupporting. springs associated Awitlilsa id guides for permittingsaidthreadfing cutter to move 'toward or fromsaid turning cutter thethreading-operation.

13. In a'devicefor simultaneously turning and threading bolt-blanks, thecombinatiop of a relativelystationarytuming cutter,- a

- guide frame, a threading `cutter mounted upon said frame -for afloating movement toward and from said turning cutter, and 50 means fornormally maintaining said threadingv cutter in a vstated position andpermitting movement thereof away from said turning cutter. i

14. In a device for simultaneously turning 65 and threading bolt-blanks,the combination operations to, oom-I In a bolt-blank turning andthreading. device, the combination oa turning'cutter' nooners ofaturning cutter, a guide frame, a lhreziff ing cutter mounted u )n saidframe lo. movement toward an from said turning cutter and provided withcollapsible flies, springs for supporting said threading cutter for afloating motion relative to said turning cutter and means forautomatically throwing the dies out of operation when the threading oeration is completed.

l5. In a evice for simultaneously turning 'l5 and threadingbolt-blanks,the combination ofyaturning cutter, a guide frame, a threading cutterprovided with collapsible `dies und mounted upon said frame foi'movement toward and Vfrom said turning cutter s rin means for yieldinglysu porting said t rea i cutter, and means or throwing the dies into andout of operation.

16. In a device for simultaneouslyV turning and threading boltfhlanks,the combination B5 of a turning cutter, a guide frame, a threadingcutter provided with collapsible dies and mounted upon said guide framefor movement toward und from said turning cutter means for setting thedies Vfor a OQ threading action, and means for automatically throwingtl'ie dies out of action upon the completion of the threading operation.

17.' In a device for simultaneously turning and threading bolt-blanks,the combination of a turning cutter, a guide frame, a threading cutterprovided with collapsible dies and mounted upon said'frame for movementtoward and from the turning cutter, -spring means for yielilinglysupporting the thrcading cutter, means for throwing the collapsible diesinto and out of action, and means for ,variublv limiting thereciprocating movement of the threading cutter.

. 18. In a device Aforsiinultaneously turning and threading bolt-blanks,the combination of a turning cutter, a guide frame, a threading cutterprovided with collapsible dies and mounted upon said frame for movement,f towa rd and from said turning cutter, spi-irg 11 Ameans for normallysupporting the threa ing cutter and permitting' movement thereof, meansfor setting lthe collapsible dies for operation, and means forautoi'uatically throwing the sama out of operation. Y 1.

19, .In a device for simultaneously turning and threading bolt-blanks,the combination of a turning cutter, a guide frame, a thread-- ingcutter provided with collapsible dies and mounted" upon said frame formovement toward and from said turning cutter, spring means for normallysupporting the-threw!- 'ing cutter and permitting movement ,eleof, meansfor setting said collapsible .for operation, and means controlled by thefeedu.' in blank for throyving said dies automaticalyoutofoperatlm ,j ,i

, 20. ,In a device simultaneously turning and threading bolt-blanks, thecombination of a turning cutter, a guidevframe, al

Y threading cutter provided with ting the dies for of a. turning cutter,a

termountd for movement on said means for permitting said ,tion andretracting' sai threading tool arranged to receive-t ,portion of the 55b Locaties collapsible dies and mounted upon said guide frame formovement toward and from the turning cutter, s rings for movablysupportin said threading cutter, an adj ustin device or setholding thedies 1n set position,and means operated automatically by the feedingblank for throwing said lockin der ice out of aci adjusting device andthreading dies.

21. In a device for simultaneously turning and threading bolt-blanks,the combination guide frame having leveling devices thereon, a threadingeutguide frame toward and from said turningV cutter, said threadingcutter being limited in outward movement by said leveling devices andadapted for a partial rotar motion to registe'r with and travel on saidevices, springs 4Eor yieldingly supporting the threading cutter innormal position and permitting outward movement thereof, and means forpermitting limited rotary motion of the threading cutter.

22. In a boltblank turning and threading device, the combination of aturning tool, a threading tool arranged to act upon the blank as itcomes from the turning tool, turning and threading tools tohave'relative movement to compensate for variations between the turningand threading feeds, and means for automatically-throwing said threadingtool out of action.

23. In a bolt-blank turning and threading device, the combination of aturnin tool, a threading tool arranged to receive tige blank from theturning tool and to thread a turned portion of the blank while theremainder is being turned, means adapting said threading tool for anautomatic preliminary movement to accurate threading position, and meansfor thereafter permitting said threading tool to have movement withrelation to said turning tool to compensate for any variation betweenthe turning and threading feeds.

24. In abolt-blank turning and threading device, the combination of aturnin tool, a eblank turned blank while the remainderis eingturned,means adapting saidthreading tool for an automatic preliminary movementto accurate threading osition, means for thereafter permitting saidJthreading tool to have movement with relation to said turning tool tocompensate for any variation .from the turning tool and to thread aaction, lc ing means for between the turning' and threading feeds andmeans for threading -tool out of action.

automatically throwing said l device, the combination of' a turningtool,V a threading tool arran ed to receive t 1c blank g from theturning too and to thread va turned ortion of the blank while theremainderis ein'g turned, means adapting said threading tool for anautomatlc preliminary` movement to accurate threading osition, means forthereafter permitting sai threading tool to have movement with relationto said turning tool to compensate for an variation between the turmngand threa ing feeds, and meansadapted to be engaged and operated by theblank for automaticaliy throwing said threadin tool out of action.

26. In a bo t-blank turning and threading device, the combination of aturning cutter, a threadin cutter -ble dies and mounte towardand fromsaid yieldably controllin 'threading.cutter, a tgievice for adjustin thedies to threading position, a device for ooking the adjusting device insuch position, a movably mounted releasing device controlfor fioatingmovement turning cutter, springs ling said locking device, and anVadjustable contact member carried by said releasing device andcontrolled by the feeding blank.

27. A device for simultaneouslyturning and threading bolt-blankscomprising a turning cutter, a threading cutter arranged to operateuponA the blank as it comes from the turning cutter, said threadingcutter being movable relatively to said turning eutter to compensate forvariations between the threading and turning feeds, and a reducingcutter mounted to move with said threading cutter' and to operate inadvance thereof.

, 28. A device for simultaneously turning and threading boltblankscomprising a turning cutter, a threading cutter arranged to operate uponthe blank asit comes from the turning cutter, said threading cutterbeing movable relatively to said turning cutter to compensate forvariations between the threading and turning feeds, means for throwingsaid threading cutter in and out, a reducing cutter mounted to move withsaid threading cutter and to operate in advance thereof, and means forthrowingsaid reducing cutter in 'and out.

In testimony whereof I alix my signature ink presence of two witnesses.

COLUMBUSK. LA'SSITER.

Witnesses JonN L. FLETCHER, e; C. C. Hnvns.

rovided with collapsi-` the movements of sald

